yep, sell and repurchase. if you calculate your shipping costs in when you repurchase, you can get yourself a nice upgrade. There might be some bits of the computers worth bringing in your luggage (assuming you're going also) but for the most part, anything of reasonable size is going to cost too much for it to be worthwhile (for desktop machines) Especially if you're willing to buy used once there.

DVD are Region encoded. Will you be taking a US player? Will you be taking a NTSC TV for said player?